import cv2

if __name__ == '__main__':
    img00 = cv2.imread('3\\dog.bmp', -1)
    cv2.imshow('-1', img00)
    img0 = cv2.imread('3\\dog.bmp', 0)
    cv2.imshow('0', img0)
    img1 = cv2.imread('3\\dog.bmp', 1)
    cv2.imshow('1', img1)
    img2 = cv2.imread('3\\dog.bmp', 2)
    cv2.imshow('2', img2)
    img3 = cv2.imread('3\\dog.bmp', 3)
    cv2.imshow('3', img3)
    img4 = cv2.imread('3\\dog.bmp', 4)
    cv2.imshow('4', img4)
    print('img00 size', img00.shape)
    print('img0 size', img0.shape)
    print('img1 size', img1.shape)
    print('img2 size', img2.shape)
    print('img3 size', img3.shape)
    print('img4 size', img4.shape)

    cv2.waitKey(0)
    cv2.destroyAllWindows()